Abstract: 【OBJECTIVE】 An indirect hemagglutination test(IHA)was developed of Haemophilus parasuis. 【METHOD】 Haemophilus parasuis-5 that had separated and purifitied break with Super a wave ; The indirect hemagglutination diagnostic preparation was obtained by sensitization of sheep red blood cell with the purified and broken Haemophilus parasuis-5 sensitized sheep red cells. The activity and speciality of the diagnostic preparation were tested. 【RESULT】The result showed that the speciality of the reverse indirect hemagglutination diagnostic preparation is good. It could only agglutinate the same type positive antibody and could be used to detect Haemophilus parasuis-5 antibody. The activity of the diagnostic preparation is high ,it is 1:512.【CONCLUSION】 simple fast economic way to test Haemophilus parasuis antibody with The indirect hemagglutination diagnostic preparation, It is a valid means to diagnose and prevent Haemophilus parasuis